Low-impedance interface processing method of solid-state lithium battery positive electrode and positive electrode structure

A battery cathode and interface treatment technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of inability to achieve power density, solid electrolyte sheet thickness, limited contact area, etc., achieve good application prospects, inhibit Interdiffusion problem, the effect of excellent performance

Active Publication Date: 2019-05-17
杭州阳名新能源设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the mainstream solid electrolyte sheet made by pressing and sintering is relatively thick, and when the solid electrolyte layer is combined with the positive electrode material, it is often only through simple co-pressing or low-temperature treatment after coating, and the limited contact area has also become a cause. An import

Method used

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  • Low-impedance interface processing method of solid-state lithium battery positive electrode and positive electrode structure
  • Low-impedance interface processing method of solid-state lithium battery positive electrode and positive electrode structure
  • Low-impedance interface processing method of solid-state lithium battery positive electrode and positive electrode structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] First, the sol-gel method is used to prepare the Garnet-type solid electrolyte niobium-doped lithium lanthanum zirconium oxygen precursor. The required mass of lithium nitrate is weighed according to the stoichiometric ratio, and the hexahydrate lanthanum nitrate and zirconium oxynitrate are slowly added to deionized water. Then slowly add a solution containing 2% niobium pentachloride, and then add citric acid to evaporate to dryness to obtain a xerogel; finally, sinter at a high temperature to obtain a niobium-doped lithium lanthanum zirconium oxide precursor.

[0069] Mix 3 grams of niobium-doped lithium lanthanum zirconium oxide precursor, some drops of triethanolamine and 9 grams of n-hexane / isopropanol azeotropic solvent, 0.8 grams of polyvinyl butyral and dibutyl phthalate mixture and ball mill 2 hours at 500 rpm. A ball-milled mixed slurry was obtained.

[0070] The resulting slurry was tape-cast on a PET release film using a coating machine, and the blade edge...

Embodiment 2

[0074] First, the sol-gel method is used to prepare the Garnet-type solid electrolyte niobium-doped lithium lanthanum zirconium oxygen precursor. The required mass of lithium nitrate is weighed according to the stoichiometric ratio, and the hexahydrate lanthanum nitrate and zirconium oxynitrate are slowly added to deionized water. Then slowly add a solution containing 2% niobium pentachloride, and then add citric acid to evaporate to dryness to obtain a xerogel; finally, sinter at a high temperature to obtain a niobium-doped lithium lanthanum zirconium oxide precursor.

[0075] 2 grams of the above-mentioned niobium-doped lithium lanthanum zirconium oxide precursor whose surface is modified by sintering aid A, 1 gram of lithium cobaltate particles whose surface is modified by sintering aid B, and 9 grams of n-hexane / isopropanol azeotropic solvent 1. Several drops of triethanolamine were mixed with 0.8 g of polyvinyl butyral and dibutyl phthalate mixture and ball milled for 2 ho...

Embodiment 3

[0081] First, the sol-gel method is used to prepare the precursor of the perovskite-type solid electrolyte lanthanum lithium titanate, and the required mass of tetrabutyl titanate, lithium nitrate, and lanthanum nitrate are slowly added to deionized water according to the stoichiometric ratio. Then citric acid was added to evaporate to dryness to obtain a xerogel; finally, a precursor of lithium lanthanum titanate was obtained after sintering at a high temperature.

[0082] 2 grams of lanthanum lithium titanate precursor whose surface was passed through sintering aid C, 1 gram of lithium cobalt oxide particles whose surface was modified by sintering aid D, 9 grams of n-hexane / isopropanol azeotropic solvent, several drops of triethanolamine and 0.8 The mixture of polyvinyl butyral and dibutyl phthalate was mixed and ball milled at a speed of 500 rpm to obtain a ball milled mixed slurry.

[0083] The resulting slurry was tape-cast on a release film with a coating machine, and th...

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Abstract

The invention discloses a low-impedance interface processing method of a solid-state lithium battery positive electrode and a positive electrode structure. By the method, impedance of two interfaces between active material particle in a positive electrode plate and solid-state electrolyte particle and between the positive electrode plate and an electrolyte piece can be effectively reduced, so thatthe capacity of active positive electrode particle in the solid-state lithium battery can be effectively developed. The dual-layer structure ceramic piece comprising a solid-state electrolyte layer and a positive electrode layer and fabricated by the method is excellent in performance and has favorable application prospect in the field of solid-state lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a low-impedance interface treatment method and a positive electrode structure of a solid-state lithium battery positive electrode. Background technique [0002] All-solid-state batteries use solid-state electrolytes instead of organic liquid electrolytes that are prone to safety hazards, and have the advantages of high safety, high energy density and power density, and wide operating temperature range. [0003] Due to the solid-solid contact between solid-state electrolyte particles and active cathode particles, the contact interface resistance is too large, which has been a major challenge in the performance optimization of solid-state batteries in recent years. At the same time, when the solid electrolyte particles and the active positive electrode particles 1 are sintered at high temperature to prepare a composite positive electrode sheet, interdiffusion of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/10
Inventor 沈飞曾鼎元高捷孙周婷王凯铭韩晓刚
Owner 杭州阳名新能源设备科技有限公司
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